GNPy: an open source application for physical layer aware open optical networks

Ferrari, Alessio; Filer, Mark; Balasubramanian, Karthikeyan; Yin, Yawei; Rouzic, Esther Le; Kundrát, Jan; Grammel, Gert; Galimberti, Gabriele; Curri, Vittorio

doi:10.1364/jocn.382906

Cited by 135 publications

(35 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Specifically, the work in [38] quantifies the spectrum benefit that is achievable by selecting the more appropriate operational mode in an metro optical network utilizing a QoT model considering only degradation effects introduced by ROADMs filtering effects. Similar results can be achieved on a core network adopting a more accurate QoT estimation tools [39].…”

Section: Simulation Assessmentsupporting

confidence: 77%

See 1 more Smart Citation

OpenConfig and OpenROADM Automation of Operational Modes in Disaggregated Optical Networks

et al. 2020

View full text Add to dashboard Cite

OpenConfig and OpenROADM are emerging as the most relevant initiatives to support partial disaggregation, in which the optical line system is provided by a single vendor while transponders can be provided, in pairs, by different vendors. This way, vendor lock-in is eliminated at the transponder level, without significantly impacting the transmission performance. Although the above initiatives have defined YANG models reaching a good level of maturity, there are still open issues that prevent the full deployment of vendor-neutral partially disaggregated solutions. Among these, the candidate transmission modes in a transponder, including proprietary solutions, are exposed in the YANG models as opaque attributes called Operational (OP) Modes, thus limiting the awareness and the effectiveness of the SDN controller in the selection of the most appropriate transmission mode. In this work, we focus on the open issues related to the configuration and adaptation of transmission parameters. In particular, we focus on the OpenConfig concept of OP Mode enabling the abstraction of transmission complexity but currently preventing an SDN controller to manage transponders in a fully vendor-neutral way. This work first estimates, through a simulative study, the network performance benefit that is achievable by optimizing the OP mode selection. Then, a telemetry-based automated solution is proposed, designed and implemented to enhance the OP mode concept in case of both provisioning and adaptation scenarios (e.g., upon failure), also considering the impact in the tributary/client network. In particular, the following components have been designed and implemented: (i) software agent for OpenConfig transponders; (ii) software agent for OpenROADM line systems, (iii) an automatic telemetryassisted monitoring handler; and (iv) SDN control procedures implemented in the ONOS Controller. The proposed components and comprehensive solution have been evaluated in a network testbed encompassing multi-vendor network elements, successfully demonstrating a full vendor-neutral partially disaggregated provisioning and recovery operations.

show abstract

Section: Simulation Assessmentsupporting

confidence: 77%

“…Indeed, considering the QoT estimation tool in [38] spectrum save is obtained only for lightpaths traversing less that 8 ROADMs, while in the multi-domain topology is likely to have longer lightpaths. However, using more accurate QoT tools, e.g.,the GNPy tool [39], similar benefit is achievable also in core networks.…”

Section: Simulation Assessmentmentioning

confidence: 84%

OpenConfig and OpenROADM Automation of Operational Modes in Disaggregated Optical Networks

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Assumptions: As performance meter, we use the generalized signal-to-noise ratio (GSNR) [19], [20] that includes both the accumulated ASE noise introduced by amplifiers to counteract fiber loss and SRS spectral tilt, and the non-linear interference (NLI) generated by fiber non-linear propagation by using the GNPy library [21] as it has been extensively validated [22]. For the NLI calculation we follow a completely disaggregated approach where each fiber span introduces its NLI contribution independently.…”

Section: Goalsmentioning

confidence: 99%

Assessment on the Achievable Throughput of Multi-Band ITU-T G.652.D Fiber Transmission Systems

Ferrari

Napoli

Fischer

et al. 2020

J. Lightwave Technol.

Self Cite

195

View full text Add to dashboard Cite

Fiber-optic multi-band transmission (MBT) aims at exploiting the low-loss spectral windows of single-mode fibers (SMFs) for data transport, expanding by ∼11× the available bandwidth of C-band line systems and by ∼5× C+L-band line systems'. MBT offers a high potential for cost-efficient throughput upgrades of optical networks, even in absence of available dark-fibers, as it utilizes more efficiently the existing infrastructures. This represents the main advantage compared to approaches such as multi-mode/-core fibers or spatial division multiplexing. Furthermore, the industrial trend is clear: the first commercial C+L-band systems are entering the market and research has moved toward the neighboring S-band. This article discusses the potential and challenges of MBT covering the ITU-T optical bands O → L. MBT performance is assessed by addressing the generalized SNR (GSNR) including both the linear and non-linear fiber propagation effects. Non-linear fiber propagation is taken into account by computing the generated non-linear interference by using the generalized Gaussian-noise (GGN) model, which takes into account the interaction of nonlinear fiber propagation with stimulated Raman scattering (SRS), and in general considers wavelength-dependent fiber parameters. For linear effects, we hypothesize typical components' figures and discussion on components' limitations, such as transceivers', amplifiers' and filters' are not part of this work. We focus on assessing the transmission throughput that is realistic to achieve by using feasible multi-band components without specific optimizations and implementation discussion. So, results are meant to address the potential throughput scaling by turningon excess fiber transmission bands. As transmission fiber, we focus exclusively on the ITU-T G.652.D, since it is the most widely deployed fiber type worldwide and the mostly suitable to multi-band transmission, thanks to its ultra-wide low-loss singlemode high-dispersion spectral region. Similar analyses could be This work was fundedby the H2020 Metro-Haul project, no. 761727; and by the European Union Horizon 2020 research and innovation program under the Marie Skłodowska-Curie ETN WON, grant agreements 814276.

show abstract

“…Note that individual SCs are impaired differently when they cross Wavelength Selective Switches (WSS), which are part of Reconfigurable Optical Add-Drop Multiplexers (ROADM). To this end, software tools like the open source GNPy [19], being developed within the Telecom Infra Project, can be used but need to be upgraded to properly consider the filter penalties.…”

Section: Autonomous and Energy Efficient Lightpathmentioning

confidence: 99%

“…Fig. 6 presents the GSNR and the OSNR computed using an extended GNPy version [19], for one external and one internal SC vs. the number of ROADMs in the route of the lightpath for different configurations of SR and slot width. SC2 and SC4 are not reported here as their performance ia approximately the same of SC3 and SC1, respectively.…”

Section: B Dscm Performance and Qot Estimationmentioning

confidence: 99%

Autonomous and Energy Efficient Lightpath Operation Based on Digital Subcarrier Multiplexing

Velasco

Barzegar

Sequeira

et al. 2021

IEEE J. Select. Areas Commun.

Self Cite

View full text Add to dashboard Cite

The massive deployment of 5G and beyond will require high capacity and low latency connectivity services, so network operators will have either to overprovision capacity in their transport networks or to upgrade the optical network controllers to make decisions nearly in real time; both solutions entail high capital and operational expenditures. A different approach could be to move the decision making toward the nodes and subsystems, so they can adapt dynamically the capacity to the actual needs and thus reduce operational costs in terms of energy consumption. To achieve this, several technological challenges need to be addressed. In this paper, we focus on the autonomous operation of Digital Subcarrier Multiplexing (DSCM) systems, which enable the transmission of multiple and independent subcarriers (SC). Herein, we present several solutions enabling the autonomous DSCM operation, including: i) SC quality of transmission estimation; ii) autonomous SC operation at the transmitter side and blind SC configuration recognition at the receiver side; and iii) intent-based capacity management implemented through Reinforcement Learning. We provide useful guidelines for the application of autonomous SC management supported by the extensive results presented.

show abstract

GNPy: an open source application for physical layer aware open optical networks

Cited by 135 publications

References 17 publications

OpenConfig and OpenROADM Automation of Operational Modes in Disaggregated Optical Networks

OpenConfig and OpenROADM Automation of Operational Modes in Disaggregated Optical Networks

Assessment on the Achievable Throughput of Multi-Band ITU-T G.652.D Fiber Transmission Systems

Autonomous and Energy Efficient Lightpath Operation Based on Digital Subcarrier Multiplexing

Contact Info

Product

Resources

About